Connected: An Internet Encyclopedia
RFC 850 - 2.2 Optional Headers

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### 2.2 Optional Headers

2.2.1 Reply-To
2.2.2 Sender
2.2.3 Followup-To
2.2.4 Date-Received
2.2.5 Expires
2.2.6 References
2.2.7 Control
2.2.8 Distribution
2.2.9 Organization

Next: 2.2.1 Reply-To

Connected: An Internet Encyclopedia
RFC 850 - 2.2 Optional Headers